1 1 9.8.4.3 Register names 1 ...................... 1 1 A '$' character may always prefix a general or special register name in 1 an instruction operand but is mandatory when the option 1 '--no-underscore' is specified or when the '.syntax register_prefix' 1 directive is in effect (⇒crisnous). Register names are 1 case-insensitive. 1